Messages in this thread Patch in this message | | | From | Jinyang He <> | Subject | [PATCH v2 3/6] LoongArch: Adjust PC value when unwind next frame in prologue unwinder | Date | Thu, 29 Dec 2022 14:15:14 +0800 |
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When state->first is not set, the PC is a return address in the previous frame. We need to adjust it value in case overflow to the next symbol.
Signed-off-by: Jinyang He <hejinyang@loongson.cn> --- arch/loongarch/kernel/unwind_prologue.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kernel/unwind_prologue.c index 3fbb9c65d64e..f7994ed05f04 100644 --- a/arch/loongarch/kernel/unwind_prologue.c +++ b/arch/loongarch/kernel/unwind_prologue.c @@ -48,7 +48,7 @@ static bool unwind_by_prologue(struct unwind_state *state) { long frame_ra = -1; unsigned long frame_size = 0; - unsigned long size, offset, pc = state->pc; + unsigned long size, offset, pc; struct pt_regs *regs; struct stack_info *info = &state->stack_info; union loongarch_instruction *ip, *ip_end; @@ -70,6 +70,10 @@ static bool unwind_by_prologue(struct unwind_state *state) return true; } + /* When first is not set, the PC is a return address in the previous frame. + * We need to adjust it value in case overflow to the next symbol. + */ + pc = state->pc - (state->first ? 0 : LOONGARCH_INSN_SIZE); if (!kallsyms_lookup_size_offset(pc, &size, &offset)) return false; -- 2.34.3
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